Monday, November 28

A virtual keyboard is
actually a key-in device, roughly a size of a fountain pen, which uses highly
advanced laser technology, to project a full sized keyboard on to a flat
surface. Since the invention of computers they had undergone rapid
miniaturization. Disks and components grew smaller in size, but only component
remained same for decades -its keyboard. Since miniaturization of a traditional
keyboard is very difficult we go for virtual keyboard. Here, a camera tracks
the finger movements of the typist to get the correct keystroke. A virtual
keyboard is a keyboard that a user operates by typing on or within a wireless
or optical dectable surface or area rather than by depressing physical keys.

Types of
Keyboards

Keyboards have
changed very little in layout since their introduction. In fact, the most
common change has simply been the natural evolution of adding more keys that
provide additional functionality.

The most common keyboards are:

•101 -key Enhanced keyboard

•104-key Windows keyboard

• 82-key Apple standard keyboard

•108-key Apple Extended keyboard

Portable computers
such as laptops quite often have custom keyboards that have slightly different
key arrangements than a standard keyboard. Also, many system manufacturers add
specialty buttons to the standard layout. A typical keyboard has four basic
types of keys:

•Typing keys

•Numeric keypad

•Function keys

•Control keys

Virtual Keyboard

A virtual keyboard is
a keyboard that a user operates by typing (moving fingers) on or within a wireless
or optical-detectable surface or area rather than by depressing physical keys.
In one technology, the keyboard is projected optically on a flat surface and,
as the user touches the image of a key, the optical device detects the stroke
and sends it to the computer. In another technology, the keyboard is projected
on an area and selected keys are transmitted as wireless signals using the
short-range Bluetooth technology. With either approach, a virtual keyboard
makes it possible for the user of a very small smart phone or a wearable
computer to have full keyboard capability. Theoretically, with either approach,
the keyboard can be in space and the user can type by moving fingers through
the air! The regular QWERTY keyboard layout is provided.

Canesta Keyboard Ir Light Source

The Canesta Keyboard
Light Source (IR-CK100) plays a critical role in any Canesta Keyboard
Perception Chipset implementation by enabling Canesta's patented electronic
perception technology. The module collects the IR laser diode and all the
associated optics into a single concise package, making it easy to integrate into
a final product. The IR Light Source operates by emitting a beam of infrared
light. This light beam is designed to overlap the area on which the Canesta
Keyboard Pattern Projector (PP-CK100) displays the keyboard layout so that the
user's fingers are illuminated by the infrared light beam. The Canesta Keyboard
Sensor Module (SM-CK100) detects the finger movement and the typing activity is
resolved into the appropriate keystrokes or mouse actions.

Scurry - The Samsung Product

Samsung's Scurry is
also a wearable keyboard. It works by attaching motion sensors to each finger.
It doesn't detect muscle movement, but rather uses gyroscopic technology to
detect angular movements of fingers through space. This approach works better:
Demonstrations on the show floor were far more impressive than its competitor's
performance in terms of accuracy. However the device is too bulky.
Nonfunctional prototypes of the final product are much smaller. The model
demonstrated is wired. The manufacturers say, by the time their products become
commercially available they will support the wireless Bluetooth protocol. Also
the product requires specialized software for handheld devices.

Advantages Of Virtural Keyboard

• Portability

• Accuracy

•Speed of text entry

• Keyboard layouts
can be changed by software allowing for foreign or alternative keyboard layouts

Conclusion

Virtual keyboards are
projected images of the real thing that let typists compose their sentences on
any flat surface. They are inching closer to store shelves. The keyboard will
be convenient for people who travel so they can easily access information through
web pages. This will be efficient for individuals that have physical
disabilities. This technology will provide a keyboard that does not require
force to activate the keys. It will serve disabled people better.

1 comments:

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